help [protein]

Help!! We are looking for a method which will allow us to determine protein concentrations from crude cell extracts containing 1% SDS. Our sample size is less than 0.5 ml and we need to be able to measure microgram per ml quantites of protein. If you can help or know someone who can, please e-mail to :
danluo at magnus.acs.ohio-state.edu
Thank you very much in advance